A good overview of the possible implications of Pennsylvania on the general election. The essential question boils down to this: is Obama's perceived weakness with white working class voters worse in terms of overall electability than the sheer visceral hatred Hillary Clinton engenders on the Right?
My thoughts? I tend to agree with the argument that since McCain's share of the national vote hasn't broken 45% no matter what has happened to either Clinton or Obama, it may well be that he has already peaked. If that's the case, barring a catastrophe between now and Denver, things should be okay for the forces of Good.
UPDATE: Further analysis from Charlie Cook, who usually has a pretty well polished crystal ball.